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DI-21 1
DIAGNOSTICS - AUTOMATIC TRANSMISSION
DI9OC-01
DTC P1783 Transfer N SW Circuit Malfunction
CIRCUIT DESCRIPTION
The propeller shaft and wheels are free even when the transmission shift lever is set to P as long as the
transfer shift lever is in Neutral position. The A/T.P. indicator light lights up to warn the drive that the propeller
shaft and wheels are not locked.
If the A/T.P. indicator light goes on, the transfer shift lever should be shifted out of N position.
The ECM receive signal TFN from the indicator switch (neutral position switch).
DTC No. DTC Detecting Condition Trouble Area
While driving under conditions (a) and (b) for 30 seconds or
more, the indicator switch(TFN switch) is ON . S Short in transfer neutral position switch signal circuit
P1783 (2-trip detection logic) S Transfer neutral position switch
(a) Vehicle speed: 25 km/h (16 mph) or more S ECM
(b) Transfer shift position is H
WIRING DIAGRAM
4WD
D4 ECM
transfer L4 Position 7 J/C 2
B B
W-B W-B L-R L-R
II4 J7 J8 E12 L4
2 1
D5
transfer Neutral Position 22 A J/C 11
C
B-R B-R B-R
II4 J7 J8 E12 TFN
W-B 2 1
J8 C
W I14 B-R
Ignition Switch 14
2 C25
2 AM1
Driver Side
A/T P
2
J/B IG1 4 Combination Meter
AM1
B-Y
1
C26 2
2
1I 2 L-Y
ALT
Driver Side J/B
GAUGE
I11 2
1
L-Y
2 1
W P1
1F 7 Park/Neutral
Position Switch
Battery 20 3
B-Y B-Y
II4
D11934
2002 4RUNNER (RM887U)
Author : Date : 387
DI-212
DIAGNOSTICS - AUTOMATIC TRANSMISSION
INSPECTION PROCEDURE
1 Check park/neutral position switch (See page DI-203 ).
NG Replace the park/neutral position switch.
OK
2 Check transfer neutral position switch.
PREPARATION:
Remove the transfer park/neutral position switch (See page
TR-9 ).
CHECK:
Push
Check that there is continuity between terminals, as shown.
OK:
Switch position Specified condition
Push Continuity
Free No continuity
Ohmmeter
F01140
Q07482 F03418
OK Replace the transfer neutral position switch.
NG
2002 4RUNNER (RM887U)
Author : Date : 388
DI-213
DIAGNOSTICS - AUTOMATIC TRANSMISSION
3 Check combination meter (See page BE-45 ).
NG Repair or replace the combination meter.
OK
4 Check voltage between terminal TFN of ECM and body ground.
PREPARATION:
ON
TFN Remove the ECM with connectors still connected.
CHECK:
Turn the ignition switch ON, measure voltage between terminal
TFN of ECM and body ground when transfer shift lever is shifted
to the following position.
OK:
Transfer shift position Voltage (V)
D11997
N Below 1.5
Except N 9 - 14
OK Proceed to next circuit inspection shown on
problem symptom chart (See page DI-175 ).
NG
5 Check for open or short circuit in harness and connector between transfer neu-
tral position switch and ECM ( See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
2002 4RUNNER (RM887U)
Author : Date : 389
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